Xenus™ Regen Guide
P/N 95-00306-000
Version 1.0
June 2003
Xenus Regen Guide
Operational Theory
2.15: Regen Resistor Theory
2.15.1: Regeneration
When a load is accelerated electrical energy is converted into mechanical energy. During
deceleration the conversion is reversed. This is called regeneration. Some of this regenerated
energy is lost to friction in the mechanical system. More of this energy is converted to heat due to
2
I R losses in the motor windings, cabling and drive electronics. The remainder of the energy is
added to the electrical energy already stored in the internal capacitor bank of the amplifier. The
result of this energy being added is an increase in the voltage on the capacitor bank.
2.15.2: Regen Resistor
If too much energy is added to the capacitor bank, the voltage will rise to a point where the
amplifier's over voltage protection will shut down the amplifier. To prevent this, a regen circuit
shunts some of the energy into an external resistor, known as a regen resistor, when the voltage
rises too high.
2.15.3: Regen Circuit Components
The amplifier provides an internal transistor that is used in combination with an external resistor.
Copley Controls supplies compatible resistors. When using a resistor acquired from another
source, be sure it meets the specifications described in
Regen Resistor Sizing and Configuration (p. 135).
2.15.4: Regen Circuit Protections
The amplifier protects the regen circuit against short circuit, and uses I2T peak current/time
algorithms to protect both the external resistor and internal transistor.
2.15.5: Configurable Custom Resistor
The following values can be entered for a custom resistor using CME 2:
Option
Description
Resistance Value
Value in ohms of the resistor
Continuous Power
Continuous power rating of the resistor
Peak Power
Peak power rating of the resistor
Time at Peak Power
Time at peak power of resistor
For more information, see Regen Resistor (p. 83) and
Regen Resistor Sizing and Configuration (p. 135)
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Specifications
3.5: Regen Circuit Output
Model
XSL-230-18
XSL-230-36
XSL-230-40
Continuous Power
2 kW
4 kW
Peak Power
5 kW
10 kW
Minimum Resistance
30
15
Minimum Resistor Wattage
25 W
50 W
Turn On Voltage
+390 Vdc
Turn Off Voltage
+380 Vdc
DC Bus Capacitance
1760 µF nominal
Regen Energy Absorption Capacity
Input Voltage 120 Vac
Copley Controls Corp.
108 joules
208 Vac
57 joules
240 Vac
32 joules
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Xenus Regen Guide
Wiring
4.4: Regen Resistor (J3) (Optional)
Mating Connector
Description
Euro-style, 5 position, 5.0 mm pluggable male terminal block.
Manufacturer PN
Wago 721-605/000-043
Wire Size
22 - 14 AWG
Recommended Wire
14 AWG, 600 V
(Shielded cable used for CE compliance)
Wire Insertion/Extraction Tool
Wago 231-131
Connector and tool are included in connector kit XSL-CK or XSL-CA
Pin Description
Pin
Signal
Function
1
Regen +
+ DC Bus to one side of regen resistor
2
N/C
No connection
3
Regen -
Collector of regen transistor to one side of regen resistor
4
N/C
No connection
5
Ground
Enclosure ground and cable shield
Regen Resistor Wiring Diagram
Amplifier
J3
+ DC Bus
J3-1
Regen +
Fuses
Regen
Resistor
Enclosure
J3-2
J3-3
Regen -
J3-4
J3-5
- DC Bus
Regen Resistor Fusing
Recommended Fuses:
Regen Resistor
Fuse type
XSL-RA-01
Cooper Bussman KLM-8 or equivalent
XSL-RA-02
Cooper Bussman KLM-12 or equivalent
User Supplied
See Regen Resistor Sizing and Configuration (p. 135).
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Xenus Regen Guide
Quick Setup with CME 2
5.6.6: Regen Resistor
For more information on the external regen resistor, see Regen Resistor Theory (p. 35), and
Regen Resistor Sizing and Configuration (p. 135).
5.6.6.1
Click Configure Regen (
) to open the Regen Resistor screen.
5.6.6.2
Select a resistor option.
Option
Description
None
No external regen resistor is used.
XSL-RA-01
Standard regen resistors supplied by Copley Controls.
XSL-RA-02
Custom Resistor
5.6.6.3
User-supplied resistor. See Regen Resistor Sizing and Configuration (p. 135).
Click OK to save regen settings to flash memory and close the Regen Resistor screen
OR
click Cancel to restore to previous values and close the screen.
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APPENDIX
A: REGEN RESISTOR SIZING AND
CONFIGURATION
This chapter describes the formulas used to determine if a regen resistor is required and what the
optimal resistor characteristics would be for a given application. For an overview of regeneration
and regen resistors, see Regen Resistor Theory (p. 35).
The contents of this chapter include:
Title
Page
A.1: Sizing a Regen Resistor................................................................................................................................................... 136
A.2: Configuring a Custom Regen Resistor ............................................................................................................................. 140
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Regen Resistor Sizing and Configuration
Xenus Regen Guide
A.1: Sizing a Regen Resistor
A.1.1: Gather Required Information
Calculating the power and resistance of the regen resistor requires information about the amplifier
and the rotary or linear motor application.
A.1.1.1
A.1.1.2
For all applications, gather the following information:
1
Details of the complete motion profile, including times and velocities
2
Amplifier model number
3
Applied line voltage to the amplifier
4
Torque constant of the motor
5
Resistance (line-to-line) of the motor windings.
For rotary motor applications, gather this additional information:
1
Load inertia seen by the motor
2
A.1.1.3
Inertia of the motor.
For linear motor applications, gather this additional information:
1
Mass of the moving load
2
Mass of the motor forcer block if the motor rod is stationary
OR
Mass of the motor rod if the motor forcer block is stationary.
A.1.2: Observe the Properties of Each Deceleration During a Complete Cycle
of Operation
A.1.2.1
136
For each deceleration during the motion cycle, determine:
1
Speed at the start of the deceleration
2
Speed at the end of the deceleration
3
Time over which the deceleration takes place.
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Xenus Regen Guide
Regen Resistor Sizing and Configuration
A.1.3: Calculate Energy Returned for Each Deceleration
Use the following formulas to calculate the energy returned during each deceleration:
Rotary motor:
Edec= ½ Jt (b12 - b22)
Where:
Edec = Energy returned by the deceleration, in joules.
2
Jt = Load inertia on the motor shaft plus the motor inertia in kg m .
b1 = Shaft speed at the start of deceleration in radians per second.
b2 = Shaft speed at the end of deceleration in radians per second.
b = 2c RPS.
Linear motor:
Edec= ½ Mt (V12 - V22)
Where:
Edec = Energy returned by the deceleration, in joules.
Mt = Total mass of the load and the moving part of the motor in kg.
V1 = Velocity at the start of deceleration in meters per second.
V2 = Velocity at the end of deceleration in meters per second.
A.1.4: Determine the Amount of Energy Dissipated by the Motor
Calculate the amount of energy dissipated by the motor due to current flow though the motor
winding resistance using the following formulas.
Pmotor = 3/4 Rwinding (F / Kt)
2
Where:
Pmotor = Power dissipated in the motor in watts.
Rwinding = Line to line resistance of the motor.
F = Force needed to decelerate the motor:
Nm for rotary applications
N for linear applications
Kt = Torque constant for the motor:
Nm/Amp for rotary applications
N/Amp for linear applications
Emotor = Pmotor Tdecel
Where:
Emotor = Energy dissipated in the motor in joules
Tdecel = Time of deceleration in seconds
A.1.5: Determine the Amount of Energy Returned to the Amplifier
Calculate the amount of energy that will be returned to the amplifier for each deceleration using
the following formula.
Ereturned = Edec - Emotor
Where:
Ereturned = Energy returned to the amplifier, in joules
Edec = Energy returned by the deceleration, in joules
Emotor = Energy dissipated by the motor, in joules
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Regen Resistor Sizing and Configuration
A.1.6: Determine if Energy Returned Exceeds Amplifier Capacity
Compare the amount of energy returned to the amplifier in each deceleration with the amplifier's
energy absorption capacity. For related amplifier specifications, see Regen Circuit Output (p. 39).
For mains voltages not listed in the specification table, use the following formula to determine the
energy that can be absorbed by the amplifier.
2
W capacity = ½ C (Vregen2 - (1.414 Vmains) )
Where:
W capacity = The energy that can be absorbed by the bus capacitors, in joules.
C = Bus capacitance in farads.
Vregen = Voltage at which the regen circuit turns on, in volts.
Vmains = Mains voltage applied to the amplifier, in volts AC.
A.1.7: Calculate Energy to be Dissipated for Each Deceleration
For each deceleration where the energy exceeds the amplifier’s capacity, use the following
formula to calculate the energy that must be dissipated by the regen resistor:
Eregen = Ereturned - Eamp
Where:
Eregen = Energy that must be dissipated in the regen resistor, in joules.
Ereturned = Energy delivered back to the amplifier from the motor, in joules.
Eamp = Energy that the amplifier will absorb, in joules.
A.1.8: Calculate Pulse Power of Each Deceleration that Exceeds Amplifier
Capacity
For each deceleration where energy must be dissipated by the regen resistor, use the following
formula to calculate the pulse power that will be dissipated by the regen resistor:
Ppulse = Eregen / Tdecel
Where:
Ppulse = Pulse power in watts.
Eregen = Energy that must be dissipated in the regen resistor, in joules.
Tdecel = Time of the deceleration in seconds.
A.1.9: Calculate Resistance Needed to Dissipate the Pulse Power
Using the maximum pulse power from the previous calculation, calculate the resistance value of
the regen resistor required to dissipate the maximum pulse power: For related amplifier
specifications, see Regen Circuit Output (p. 39).
R = Vregen2 / Ppulse max
Where:
R = Resistance in ohms.
Ppulse max = The maximum pulse power.
Vregen = The voltage at which the regen circuit turns on.
Choose a standard value of resistance less than the calculated value. This value must be greater
than the minimum regen resistor value specified in Regen Circuit Output (p. 39).
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Xenus Regen Guide
Regen Resistor Sizing and Configuration
A.1.10: Calculate Continuous Power to be Dissipated
Use the following formula to calculate the continuous power that must be dissipated by the regen
resistor. Use each deceleration where energy is dissipated by the regen resistor.
Pcont = ( Eregen 1 + Eregen 2 + Eregen …) / Tcycle
Where:
Pcont = The continuous power that will be dissipated by the resistor in watts.
Eregen n = Energy being dissipated during decelerations, in joules.
Tcycle = Total cycle time in seconds.
Choose a resistor with a power rating equal to or greater than the calculated continuous power.
Verify that the calculated power value is less than the continuous regen power rating specified in
Regen Circuit Output (p. 39).
A.1.11: Select Fuses
For custom regen resistors, Cooper Bussman KLM fuses, or equivalent, should be selected. The
peak and continuous currents, as well as the peak current time, must be taken into consideration
for proper fuse selection. The duration of the peak current is the deceleration time (Tdecel)
associated with the maximum pulse power regen event.
Use the following formulas to determine the minimum peak and continuous current ratings of the
fuse. For related amplifier specifications, see Regen Circuit Output (p. 39).
The peak current is determined by the chosen regen resistor value.
Ipeak = Vregen / Rregen
Where:
Ipeak = The current though the regen resistor during regeneration in amps.
Vregen = The voltage at which the regen circuit turns on.
Rregen = The resistance value of the chosen regen resistor in ohms.
The continuous current is determined by the continuous regen power.
Icont = Pcont / Vregen
Where:
Icont = The minimum continuous current rating the fuse requires in amps.
Pcont = The continuous power calculated in the previous step, in watts.
Vregen = The voltage at which the regen circuit turns on.
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Regen Resistor Sizing and Configuration
A.2: Configuring a Custom Regen Resistor
A.2.1: Regen Configuration Objective and Warning
Configure the amplifier to operate properly with the custom resistor.
!
WARNING
Incorrect values may damage amplifier or external regen resistor.
2
For the I T algorithms to work correctly, the values entered in the following steps
must be correct. Damage to the external regen resistor may result from incorrect
values entered. Damage to the amplifier may result if an incorrect resistance value is
entered.
Failure to heed this warning can cause equipment damage.
A.2.2: Regen Configuration Instructions
A.2.2.1
On the Main screen, click Configure Regen (
screen.
A.2.2.2
Select Custom Resistor and then click Configure to open the Custom Regen
Configuration screen.
A.2.2.3
Enter a Resistance within the range described on the screen. Click Next for Step 2.
A.2.2.4
Enter a Continuous Power within the range described. Click Next for Step 3.
140
) to open the Regen Resistor
Copley Controls Corp.
Xenus Regen Guide
Regen Resistor Sizing and Configuration
A.2.2.5
Enter a Peak Power within the range described. Click Next for Step 4.
A.2.2.6
Click Next for Step 5.
A.2.2.7
Review the configuration.
A.2.2.8
Click Finish to save the configuration to volatile and flash memory and close the
screen
OR
click Prev to modify any values
OR
click Cancel to close the screen without saving any changes.
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Ordering Guide
E.5: Regen Resistor Specifications
E.5.1: Specifications
Model
Resistance
Continuous Power
Peak Power
For Use With
XSL-RA-01
30 ohms
167 W
5 kW
XSL-230-18
XSL-RA-02
15 ohms
200 W
10 kW
XSL-230-30
XSL-230-40
E.5.2: Dimensions
Dimensions in inches
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